[swift-evolution] Add unless/if single line syntax

[Al Skipp]

If at all possible I think it’s best to avoid adding keywords to the language. Instead of ‘unless', you could do: 

public func not(bool: Bool) -> Bool { return !bool }

if not(condition) { print("condition was false") }

Not terrible ¯\_(ツ)_/¯


> On 12 Dec 2015, at 15:48, Matthew Johnson via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I’m not sure about the single line aspect of this proposal, but I am a big proponent of “unless” and “until” as complements to “if” and “while”.  They greatly improve readability over "if !(expression)” and “while !(expression)” IMHO.
> 
>> On Dec 12, 2015, at 9:45 AM, Arthur Ariel Sabintsev via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> For your specific example, I'd 100% use the guard statement. It achieves the same result.
>> 
>> -1 from me.
>> On Sat, Dec 12, 2015 at 9:43 AM J. Cheyo Jimenez via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> -1 from me.  I think I would rather have an if-then expression that would handle both False and True cases. 
>> https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html <https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20151207/001944.html>
>> 
>> Also, in most cases I feel that guard would be a better choice. 
>> 
>> 
>> 
>> On Sat, Dec 12, 2015 at 5:39 AM, James Campbell via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> I propose adding the unless and if statements from ruby.
>> 
>> Return false if james = nil
>> 
>> This returns false if the variable James is nil
>> . This line does it unless james is nil:
>> 
>> Return false unless james = nil
>> 
>> This has been really handy when working in ruby, reduces lines and pyramids of doom
>> 
>> Sent from my iPhone
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